Do it yourself
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In this video tutorial, you will see how to dismantle the sprocket and pinion on a Derbi Terra 125, following these simple instructions. First, remove the timing chain by taking out the clip with something sharp; then open the pinion cover by unscrewing the securing screws, and remove the timing chain and the pinion. At this point, dismantle the central axle of the wheel and unscrew the securing screws of the sprocket; once removed, replace it with the new one, along with the pinion. All that’s left is to reassemble everything by applying the reverse procedure!

Updated on 4 April 2026 by ScegliAuto

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